Abstract
Various offshore wind farms have been proposed in the Taiwan strait with a long-term target of installing 4.2 gigawatts by 2030. The proposed projects will be in areas with various known faults and areal seismic sources which should be accounted for in design. A reliable prediction of site response for soil deposits is crucial for seismic loading evaluation of existing energy structures and for design of new structures including offshore wind farms in seismically active regions. This paper presents generic results of 1-D site response analyses based on work performed for an offshore wind power plant development site in the Taiwan strait. The deposits in the project area generally consist of layered deposits with liquefiable layers. The site response analyses were initially performed using two different open-source tools, DEEPSOIL and Cyclic 1D. Both equivalent linear and non-linear approaches were adopted for the analyses and additional evaluations were subsequently performed using PLAXIS 2D for comparison with the results from the open source tools. The results from the different tools were systematically compared and provided useful insight on peak ground (seabed) acceleration, acceleration time histories and shear strains at specific depths and design response spectra. The paper includes a discussion of the sensitivity of the outputs to various input parameters for each of the tools utilized in the analyses and the suitability and limitations of each approach for assessing liquefaction potential are also discussed.
Highlights
Long-term renewable energy targets have been set by Taiwanese Government with a particular focus on the development of offshore wind power capacity
The designated offshore wind power plant zones are within an area of high seismicity where comprehensive seismic risk assessments should be performed during design
The authors previously performed equivalent linear and non-linear site response analyses both for a generic offshore wind farm site in the Taiwan strait using DEEPSOIL and Cyclic 1D as presented in Yu et al (2020)
Summary
Long-term renewable energy targets have been set by Taiwanese Government with a particular focus on the development of offshore wind power capacity. The designated offshore wind power plant zones are within an area of high seismicity where comprehensive seismic risk assessments should be performed during design. A reliable prediction of site response, as part of a seismic risk assessment, is crucial for evaluating effects of subsurface conditions on ground motions for energy structures including offshore wind farms in seismically active regions. The authors previously performed equivalent linear and non-linear site response analyses both for a generic offshore wind farm site in the Taiwan strait using DEEPSOIL and Cyclic 1D as presented in Yu et al (2020). A comparison of the results from the three tools has been performed to provide insight on peak ground (seabed) accelerations, cyclic stress ratios, acceleration time histories, shear strains and design response spectra at specific depths. Sensitivity of the results to various input parameters for each of the tools utilized in the analyses and the suitability and limitations
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